Hi hi hi KenC, I forgot to thank you for the teh tarik treat the other day. A belated thanks, and for those DIY tips too.

jazzy bro, this bloke is already as insane as all you guys.

Ahhhh.. there more the merrier!
Welcome to the T-AMP Asylum !

BTW, bro March. At NIXIE also manage to 'poison' people!

Heyyy pretty 'good' looking stuff there.. antique time machine?

I want to meet you people so desperately. Especially if we're meeting in someone's workplace/garage/workstation.

We are? Wonder where....

i meant that as in "if we were going to meet". A hypothetical speech.

Hehe.. I know LG

Last we had was at junchoo's place and before that the first session at Y.C's office..

Another T-Amp session anyone?

one of my very early DIY Gain Clone using LM1375, end up give to one of my ex-boss as present... to clear space and you know what la...

Use tissue box as chassis with some mod.

the top left is power switch, the middle is volume pot, the right is 4-position input selector switch.

Can see the intestine in the attached pic. You guys like?

Cheers

KenC


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KenC,
The question is, 'Does you ex-boss liked it'?

Do you use any 'exotic' components? Just an 'EI' tranny eh? Any problem with 'hum' and 'noises' since you're using a wooden bix?

The thing with any pix on the innards.. some like, some don't

I like it! Thanks..

This post has been edited by jazzy939: Feb 14 2009, 09:42 AM

Glad that you like it.

Donno the ex-boss like or not leh... boss like to put up square face in any occasions ma; from what I know, he never took it out from his AV system.... donno kedekut or he like...

No need exotic component everywhere one la... I normally choose from what is readily accessible. I find Rubycon caps off the shelf in Malaysia EE hardware stores very good for PS. As in signal circuits, I avoid Electrolitic caps when even I can use any plastic caps will do, my favurite are MPK, but then everone has their own preference for any reasons.

EI trans? you must know their characteristics ma... keep your signal circuits >1.5inch from the trans any you will keep those EMF at bay. if not, implement a faraday's screen loh, easy what. If trans vibrates, return to supllier la! or pur rubber feet to isolate the vibration from the chassis loh, better still put outside.

Only when you do thing like the attached pic then you guarantee all sort of noise and hum problems.... (I did it on purpose just for the challange... )

It is not absolutely true that expensive=better...

BTW, I always make sure the amp has some weight so that can hold the cables connected to the amp and not swivel around when I turn the volume Pots.


Cheers

KenC


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KenC,
I agree.. 'bosses' are hard to 'judge'..

I don't rally go all out with exotic/audiophile components.. only a few 'fav' choices..
I would just use the normal JP variant and see how it perform in 'stock' form.. then if it's lacking in a certain department, only then I'l start tweaking with different type of components...

Yeah.. those 'EI' need to be away alright.. When I need to use one.. they're 'out of sight'!

I too have a softspot for MPKs...

I truely agreed.. In order to enjoy music.. you need not break the bank.. and upset the missus at the same time!

Interesting pic.. tube preamp/buffer?

This post has been edited by jazzy939: Feb 14 2009, 11:13 AM

Hi Jazzy,

Its an Aikido preamp, P2P, regulated PS, 6n1p front 5965 back. 4 triodes per channel, P2P on PCB ground plane.

This circuit topology is soo neutral!!! It tames characteristics of tube, most tubes I tried don't have drastic sonic characteristics.

Difficult to build oh....

Attached is much more simple preamp using 1626 during my early stage of learning tubes.


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Hi KenC,
Thanks for replying...

Ahhhh, The Aikido... have read a lot about it.. never heard one!

I have not started anything on tubes.. will ask you for pointers if you don't mind...

Still keeping your first build eh..? Still working I presumed?

Yup, a faster way of learning is to build one! And I am thinking about making a tube phono pre-amp... you know any good/simple/cheap circuits?

This post has been edited by jazzy939: Feb 14 2009, 01:26 PM

I actually build quite a few of experimental preamps.... easily over 20 sets ... some gave away, most dismantle for more builts... now only have 3 units of Aikido with different construction/layout/gounding techniques...

Phono preamp, MC?

Its very easy to design one.... and there are thusands of circuit freely available if you google a bit.

I wouldn't recommend anyone to build a phono as 1st project, unless
1) they are familiar with high tension electricity
2) they had learnt how to tame hum/noise
3) sure with RIAA
4) buy a kit.

Very easy to
1) get killed
2) discourage.

No pun intended

I would suggest a simple buffer pre-amp for 1st time builder. Interested?

Cheers

KenC

I've done 'googling' alright! Many circuits with hard to get tubes

Initially I was planning to start with MM phono preamp. I already have the VSPS.

Yep. I am aware of the points highlighted. Good reminder though!

A simple buffer preamp, why not!

Shall we start a new thread for this? This is kinda hijacking the T-Amp thread!

Thanks again KenC.

Hi,

Yes, we should start a new thread for a tube buffer pre amp.

BTW, where you guys get the T-amp?

Cheers

KenC

xtorm is the guy who 'bulked' the item few times over. Used to be RM55, now it's RM60 each.

Here' the link.

Thanks jazzy, just PM him. wonder if there are higher power units?

Also curious what speakers you guys used for the T-amp?

KenC,
There are other variants of the T-Amp made by Tripath and other similar Class D amplifications.. we're kinda nuts about TA2024 because of it's price, thus 'value for money/best bang per buck' category.

Any high efficiency speakers can be driven by the T-Amp effortlessly..
I am using transmission line 90dB/W/m speakers.

Jazzy,
Thanks for your reply,

More question,
What is
a) the input Impedance?
b) Input sensitivity?
I am sure the answers are within those ~200pages of threads, I might have to get new glasses after reading all... Can someone help save the reading time?

Cheers

KenC